Question

determine x e y 3x-y=18
x+y=10

Answer 1

3X-Y=18

X+Y=10
X=10-Y


3(10-Y)-Y=18
30-3Y-Y=18
-4Y=18-30
-4Y= -12
Y= -12/ -4
Y=3


X=10-Y
X=10-3
X=7



ok